Exhaust-pressure governor eob



.Im 2s, 1923. 1,459,962

L` H. WHEELER EXHAUST PRESSURE GOVERNOR FOR SUCTION FEED SYSTEMS Filed April 14, 1922 Patented June 276, 1923.

LEONARD H. WHEELER, F CIIICl-f'll. ILLINOIS. ASSIGNOR TO STEWARTARNER SPEEDOMETER CORPORATION, 0F CHICAGO,

VIRGINIA.

ILLINOIS, A. CORORATION OF EXHAUST-PRESSURE GQVERNOIL'FOR SUCTIGN-FEED SYSTEMS.

Applicationled April 14, 1922. Serial No. 552,307'.

To all wom'it may concern.'

Be it known that l, LEONARD H. VHneLnn, a citizen of the United States, residing in the city'of Chicago, in the county of Cook and State of illinois, have'invented certain new and useful Improvements in'EXhaust-Pressure Governors for Suction-Feed Systems, of which the following' is a specification, reference being had to the accompanying drawings, forming apart thereof.

This invention relates to liquid feeding apparatus ofthe type commonly known as the vacuumfeed, and its purpose is to provide a construction associated with the exhaust pipe or conduit of an engine for utilizing the flow of the exhaust to produce suction or vacuum for operating the feed device. It consists of certain features of construction hereinafter described and shown in the drawings, as indicated by the claims.

In the drawings rv Figure 1 is a diagrammatic side elevation of a liquid feed system applied to an engine having a suction producing device in the exhaust pipe constructed in accordance with this invention. v

Figure 2 is longitudinal section of the suction. producing device taken as indicated at line 22, on Figure 1.

Figure 3 is a similar sectional view on a smaller scale, showing a modified form ofv the invention.

The liquid feed system shown in the drawings comprises the usual low level supply tank, A, which, as illustrated, may be understood as the fuel supply tank for an internal combustion enginey shown at B, and having the carbureter, C, to which the fuel is fed by a vacuum feed tank, D, of well understood construction, such as that shown in J ay Patent No. 1,125,549, dated January 19, 1915. As commonly installed at the presj ent time, such a vacuum feed device depends for its suction upon the partial vacuum produced in the intake manifold of the engine. However the suction is derived, the apparatus must include a suction line or pipe, 1, a liquid supply pipe, 2, leading from the low level tank, A, to the vacuum tank, D and a feed pipe, 3, leading from the tank, D to the carbureter, C. v

The engine exhaust manifold shown at 4 communicates with the exhaust pipe, 5

through the suction producir-1g device embodying this invention and "including a sleeve-like fitting or conduit, 6, which provides a chaninber in which the pressure of the exhaust gases from the manifold, 4, is allowed to accumulate against a relief valve or shutter, 8, shown as pivotally hung' in the passage or chamber, i', on a rock shaft, 9, and ..iased to closed position. by means of a spring, 10, extending between a hook yrigidly set the shaft, 9, and an anchor pin or eye secured in the wall of the member, 6. The back pressure thus created is relieved through a Venturi tube, 11, at whose most constricted part, 12, a port, 13, communicates through the pipe, 17 with the vacuum tank, D, and the suction created by the flow of eX haust gas through the venturi thus serves to operate the facuuin tank in a well understood manner forlifting liquid from the supply tanlnrl., and discharging it through the pipe, 3. rfhe gas escaping through the venturi, 11, is conducted through an elbow, 14.

pipe7 15, to any convenient point of discharge g if desired, it may pass into the usual muffler (not shown) to which the exhaust pipe, 5, will also be coupled.

With this arrangement, it will be seen that the spring controlled valve or shutter, 8, serves to regulate and hold at a substantially uniform value the pressure of the eX- haust gases entering the venturi, 11; thus the suction produced in the pipe1, will be fairly uniform. W'hen through increased engine speed or for any other reason the pressure in the exhaust manifold, 4, becomes excessive, it will be relieved by the yielding of the shutter valve, 8, permitting a part of the gas to pass through the pipe, 5, while only a suiicient quantity is conducted through the venturi, 11, to maintain the desired uniform pressure and resultant suc tion.

Figure 3 shows a slight modification in which the sleeve, 16, which is connected to the manifold, 4, is provided with a lateral port, 17, controlled by a valve, 18, shown as of the poppet valve type having a. spring, 19, for holding it normally seated. The force of the spring, 19, is rendered' variable byl means of an adjustable stop screw, 20, against which it reacts and which is carried in the bracket, 21, mounted on the conduit, 22, to which the port, 17, leads when the n leading from the tfuel feeding means to the valve, 18, is open. Directly aligned with the manifold, Il, and sleeve, 16, is a Venturi tube, 23, vhaving a port, 24, leading laterally from its constricted throatway `for connection through the pipe, 1, with the vacuum feed tank, D. In this device the flow of exhaust gas is backed up or retarded somewhat by the presence of the venturi, 23, but' this back pressure is prevented. from becoming excessive by providing the relief valve, 18, and port, 17, through which a part of the gas may be lay-passed by Way of the conduit, 22, at any suitable connection to the muffler (not shown). The device will thus tend to maintain a fairly uniform pressure and velocity in the Venturi tube, 23, resulting in a fairly constant suc-tion effect operating through the rt, 24, and pipe, 1, to actua-te the vacuum Aeed devices in the tank, D.

I claim:

1. The combination. of an internal combustion engine provided with liquid fuel v feeding means operated by suction and an exhaust passage comprising two branches, one branch havinor a venturi With an inlet constricted portion of the venturi, and the other branch being prorided with `a valve y haust gas from the engine and the venturi opening transversely thereinto.

3. In the combination defined in claim 1, said venturi being disposed in the exhaust passage in the direct line of flow of the gas therethrough, and the valve con'trollingthe other branch being arranged to yield in aV transverse direction,

4l. In the combination defined in claim 1, means for adjusting said valve to regulate the maximum exhaust pressure to be supplied tothe venturi for thus maintaining a substantially uniform` suction effect upon the fuel feeding means.

In testimony whereof, I have hereunto set myl hand at Chicago, Illinois, this 11th day of April, 1922.

LEONARD H. WHEELER. 

